Ingest pipeline buffer for incoming documents

I am investigating using an ingest pipeline for one type of document for my cluster. I am wondering if I have a maintenance or upgrade window or even an unplanned outage does the ingest pipeline have a buffer for that downtime or is that incoming data lost?

Ingest pipeline processing is just a step in the processing of a bulk request, so the answer is no. The clients sending data to Elasticsearch need to detect the failure and buffer.

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Thanks Christian for the prompt response.

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